QoS

Quality of service is an insane but much needed topic:

Some important links:

http://kabru.eecs.umich.edu/qos_network/diffserv/DiffServ_prototype/qdisc
http://linux-ip.net/articles/Traffic-Control-HOWTO/
http://edseek.com/~jasonb/articles/traffic_shaping/
http://luxik.cdi.cz/~devik/qos/htb/
http://www.opalsoft.net/qos/